66657402018558 has 40 divisors (see below), whose sum is σ = 160851337639608. Its totient is φ = 20509969851216.

The previous prime is 66657402018509. The next prime is 66657402018563. The reversal of 66657402018558 is 85581020475666.

It is a junction number, because it is equal to n+sod(n) for n = 66657402018495 and 66657402018504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15825591916 + ... + 15825596127.

Almost surely, 2^{66657402018558} is an apocalyptic number.

66657402018558 is an abundant number, since it is smaller than the sum of its proper divisors (94193935621050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66657402018558 is a wasteful number, since it uses less digits than its factorization.

66657402018558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31651188070 (or 31651188061 counting only the distinct ones).

The product of its (nonzero) digits is 96768000, while the sum is 63.

The spelling of 66657402018558 in words is "sixty-six trillion, six hundred fifty-seven billion, four hundred two million, eighteen thousand, five hundred fifty-eight".